Paper bail mechanism for typewriters



C- W. CRUMRINE PAPER BAIL MECHANISM FOR TYPEWRITERS Sept. 4, 1951 2 Sheets-Sheet 1 Filed July 23, 1948 a N\ I 1M I:55:22:52: P

INVENTOR 6J1! QPI/MP/NE BY 0Z0 ATTORNEY j P 1951 c. w. CRUMRINE 2,565,930

7 PAPER BAIL MECHANISM FOR TYPEWRITERS Filed July 25, 1948 2 Sheets-Sheet 2 H .HH HHIH lu.-

INVENTOR CW URZ/MR/Nf ATTORNEY Patented Sept. 4, 1951 PAPER BAIL MECHANISM FOR .TYPEWRITERS Chester W.Crumrine, Rochester, N. Y., assignor to International Business Machines Corporation, New York, N. Y., a corporation of New York Application July 23, 1948, Serial No. 40,221

Claims. (01. 197-138) This invention relates to typewriting machines. Iheprimary-object of the present invention is to" provide an improved paper bail suitable for use on the carriages of typewriters and other ofiice machines.-

a An objectis to provide a paper bail which may be set in a plurality of positions to facilitate the --insertion of work sheets-around the platen of the typewriting machine. I l

An object is to provide a paper bail mechanisinwhich =is very-simple and yet is capable of being set in several different positions to suit the convenience of the operator.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of example-the principle of the invention and-the best mode, which has been contemplated, of applying that principle. Y In thedrawings: l

Fig. 1 is a vertical section through the carriage of a typewriting machine showing the paper bail mounted l thereon.

- Fig. 215 a view similar to Fig. l, but showing the paper bail drawn horizontally forwardly toward the operator.

.. Fig. 3 is a view similar to Fig. 1, but showing the paper bail set in its extreme rearward inclined position. l r

Fig. 4 is avertical section showing a modified form of retaining means for holding the paper bail in its different. set positions.

Fig. 5 is a large scale section on the line 5-5 inFigpl. A i

In the -;drawings, the carriage frame is designated "land includes the channel shaped member II, the sides of which are formed as grooves to retain the usual antifriction rollers or balls 12 by means of which the carriage is movably mounted on the guiding rails IS. The carriage rotatably supports the usual platen l4 and is provided with a paper deflector l5 having pressure rollers IS. The carriage may also be provided with the usual paper table which has been omittedfrom-the drawin to avoid confusion in showing the parts connected with the paper bail. The foregoing parts may all be conventional and their specific construction plays no important part inthe present invention, but are shown purely forsake of completeness.

The paper bail comprises the side arms H of which there is one adjacent each carriage side plate and at their forward or right-hand ends (-Fig.- l), the arms "support the cross rod It on which'ismounted the paper bail rollers I9. As

is usual in typewriting machines, only two rollers l9 need be provided and they may beslidably mounted on the rod I8 so as to be adjustable in accordance with the widthof the work sheets wrapped around the platen Hi. The paper bail arms I! are loosely pivotally supported on a cross shaft 20, the ends of which loosely abut the inside faces of the carriage side plates so that the shaft 20 iscapable of horizontal motion of translation from left to right and vice versa.

In order to prevent one end of the shaft from moving to right or left more than the other when the shaft is shifted bodily, the ends of the shaft may be formed as pinions 2| (Fig. 5) and each of the pinions rests on and meshes with rack teeth 22a. formed on the lower edge of a horizontal slot 22b in a plate 22, there being a' plate'22 and a pinion 2| adjacent each side plate of the car riage. These plates 22 are secured to the side plates as by meansof screws or rivets 220. In order to facilitate disassembly and keep arm's ll parallel, the shaft 2!} may be provided with collars 23 adjacent the arms I! so as to keep the arms H from becoming displaced along the shaft 20.

Each arm I! has an extension Ha formed thereon provided with a stud l'lb engaged by one arm of a toggle spring 24, the other arm of which en ages a stud carried by the adjacent carriage side plate. The toggle springs 24 are contine uously under a state of compression and, when the arms I! are in the position shown in Fig. 1, the toggle springs urge the arms l! in a clockwire direction to press the rollers l9' against the platen I4. This is the normal position of the paper bail while the work sheet is being typed.

When the operator desires to insert a new sheet, the bail rod [8 may be grasped at any point along its length and drawn forwardly or to the right in Fig. 1, thus displacing the paper bail to the position of Fig. 2 in which the rollers l9 are well clear of the platen. If a sheet now is inserted on the paper table and the platen rotated, the sheet may be fed directly upwardly without interference from the rollers [9. The toggle spring 24 is further compressed when the paper bail is drawn to the position of Fig. 2 and retains the paper bail in the position of Fig. 2 with arms l'l clear of the platen by pressing the studs llb up against the straight underedges of the plates 2.2. with rollers which act as stops to hold the arms I! slightly clear of the platen to avoid wear the work sheet.

If desired, the studs I'Ib may be provided means for retaining the paper bail inits different set positions consisting of two coil springs like 24a, one for each arm ll, stretchedhoriz'ontally between two studs. In this case, the stud i l-b may be grooved adjacent its .head to conform to the curvature of the coils of the springz la, The spring 24a is slightly bent around the stud Hb in order that sufficient tension may exist on said stud to urge the arm I! in a clockwise direction to engage the rollers IS with the platen I l. When the paper bail is drawn forwardly or to the right (Fig. 4), the studs l'lb glide over the springs 24c and thest ds .I briding on the underside .of the plate-g2, maintain the arms of the paper bail horizontal, as in Fig. 2, clear of the platen; In eitl er the position of Fig. 4:, or theequivalent of the position shown in vFig.2, the paper bail may be rocked upwardly to a position similar to the 'one shown in Fig. 3 in which the paper bail is well clear of the platenand paper table. .Inrotating thepaper hail, the springs 2 5a will be defiec'ted downwardly and tensioned, but will close inbehind the studs 1 lb to maintain the paper bail V in .the vertical position similar to Fig. 3.

.Qne .of the advantages of the paper. bail is its extreme simplicity due to the fact that all of .the part nece s ry o maintainin the different positionsare compact enough to be located close to the carriage side plates so as not to interfere with any of the carriage borne mechanism such as the column stops and the marginal stop .racl:

which are normally located behind the platen.

While there have been shown and described and pointed out the fundamental novel features of the invention as pplied to a preferred emsediment, it will be understood that various omissions and substitutions and changes in the formand details of the device illustrated and in its operation may be made by those skilled in the art ithout depa ting from the spirit of the invention. It is the intention, therefore, to be limited only as indicated by the scope of the follow ng .claimsa What is'claimed is:

1.-. in a tvpewriting or like machine havin a platen. a pap r bai mechanism .G mprising a pap r bail including a cross-bar having a plurality of bail rollers for pressing work sheets against the platen and a pair of side arms for-said crossbar, a cross shaft pivotally supporting said arms and having its ends provided with gear teeth adjacent said arms; a pair of racks, one for each side arm and meshing with said gear teeth, said gear teeth rolling over said racks to permit the bail rollers to be withdrawnfrom the platen and, when .so withdrawn, maintaining the shaft parallel with the platen; and spring means coacting with said arms to yieldingly hold said rollers in engagement with said platen or in withdrawn position. 7 V

2.. n a yp ritin or like machine hav ng a platen, a paper bail mechanism comprising a bail cross-bar having bail rollers engageable with the platen and hail side arms, spring means for urg ng said side arms in a direction to engage said rollers with said platen; and means to pivotally slidably mount said side arms including a 4 i cross shaft extending parallel with the platen and pivotally supporting said side arms and provided with gear teeth at its ends, and a pair of fixed guide plates having guideslots receiving the ends of said shaft and formed with rock teeth meshing withsaid gear teethto maintainthe shaft parallel with the platen while permitting said shaft and said paper bail to be bodily displaced transversely of the platen to withdraw the rollers from coaction with the platen.

3.111 a typewriting or like machine having a platen, a paper bail mechanism comprising a paper-bail frame having bail rollers resting on the platen means for pivotally slidably mounting saidframe at the ,rear of the platen, includin a pair of horizontally slotted plates and a shaft pivoting saidframe'and having its ends shaped -to have rolling contact with the walls of the slots infield-plates to compel said shaft to move parallel with the platen when the frame is drawn forwardly of the platen; and springmeans acting on said frame to hold the frame in either the position in which the rollers rest on the platen, or theforwardly drawn position.

4. In a typewriting or like machine having a platen, a paper bail mechanism comprising a paper-bail frame, support mechanism for said frame comprising a shaft for pivotally supporting the paper bail frame at one side of the platen, and support plates for the ends of said shaft shaped to have rolling contact engagement with the ends of the shaft to enable the frame to be drawn toward the opposite side of the platen while maintaining parallelism between the frame and the platen.

5. In a typewriting or like machine having a platen, apaper bail mechanism'comprising a paper bail frame including a cross-bar having a plurality of bail rollers, and rack-and-pinion means for pivotally mounting said frame in a position in which the bail rollers rest on the platen and from which the frame may be shifted to withdraw the rollers from the platen; said rack-and-pinion means maintaining said crossbar parallel with the platen while the frame is shifted. V V

-6. In a 'typewriting or like machine having a platen, a paper bail mechanism comprising a platen support frame, a support shaft extending parallel with the platen, rack-and-pinion means mounting said shaft in said frame for movement toward and away from the platen and for maintaining said shaft parallel with said platen, a paper bail having side arms pivoted on said shaft and a cross-bar provided with feed rollers .coacting with'said platen when said shaft is at its most remote rearward position with reference to the platen, said raolnand pinion means enabling said paper bail to be drawn away from said platen arms to enable said cross-bar to be moved from an alternate working position in cooperation with the platen to a forward position separated from the platen in either of which positions said paper bail may he swung on saidmounting to a vertical position, and a single common spring for each of said side arms for maintaining said paper bail in any of said positions.

8. In a typewriting or like machine having a platen, a paper bail mechanism comprising a paper bail having a cross-bar and side arms, a cross-shaft pivotally supporting said side arms, means for slidably supporting the ends of said shaft for movement of said hail from a position in which said cross-bar cooperates with said platen to an alternate position remote from the platen, in either of which positions said paper bail may be pivoted on said shaft to elevate said cross-bar to positions more remote from said platen, and spring means coacting with said side arms to yieldingly maintain said paper bail in any of said positions.

9. In a typewriting or like machine having a platen, a paper bail mechanism comprising a paper bail having a cross-bar and side armsi a cross-shaft pivotally supporting said side arms, means for slidably supporting the ends of said shaft for movement of said bail from a position in which said cross-bar cooperates with said platen to an alternate position remote from the platen, in either of which positions said paper bail may be pivoted on said shaft to elevate said cross-bar to positions more remote from said platen, and spring means coacting with said side arms to yieldingly maintain said paper bail in any of said positions, said supporting means including rack-and-pinion means for maintaining said cross-bar parallel with said platen in any of said positions.

10. In a typewriting or like machine having a platen, a paper bail mechanism comprising a paper bail having a cross-bar and side arms, a cross-shaft pivotally supporting said side arms, means for slidably supporting the ends of said shaft for movement of said bail from a position in which said cross-bar cooperates with said platen to an alternate position remote from the platen, in either of which positions said paper bail may be pivoted on said shaft to elevate said cross-bar to positions more remote from said platen, and spring means coacting with said side arms to yieldingly maintain said paper bail in any of said positions, said cross-shaft having gears secured thereto and said supporting means including racks meshing with said gears to maintain said cross-bar parallel with the platen in movement of said cross-bar to each of said positions.

CHESTER W. CRUMRINE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,517,506 Hess Dec. 2, 1924 1,663,362 Walsoe Mar. 20, 1928 1,916,371 Helmond July 4, 1933 

